phosphorylase

phosphorylase /phos·phor·y·lase/ (fos-for´ĭ-lās)

1. any of a group of enzymes that catalyze the phosphorolysis of glycosides, transferring the cleaved glycosyl group to inorganic phosphate. When not qualified with the substrate name, the term usually denotes glycogen phosphorylase (animals) or starch phosphorylase (plants).

2. any of a group of enzymes that catalyze the transfer of a phosphate group to an organic acceptor.

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phos·pho·ryl·ase (fsfr--ls, -lz)

n.

An enzyme that catalyzes the production of glucose phosphate from glycogen and inorganic phosphate.

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phosphorylase

[fosfôr′ilās]

Etymology: Gk, phosphoros, bringer of light + ase, enzyme suffix

any of a group of physiologically important enzymes that catalyze reactions between phosphates and glycogen or other starch components, yielding glucose-1-phosphate.

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phosphorylase

a key regulatory enzyme that, in the presence of inorganic phosphate, catalyzes the removal of one glucose unit from glycogen to glucose-1-phosphate.

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citrulline phosphorylase

see ornithine carbamoyl transferase.

phosphorylase kinase

an enzyme that activates phosphorylase by catalyzing the phosphorylation of serine. See also kinase.